Type mismatch with no obvious cause

[oproso]

I receive the error "type mismatch (received string expected UUID string)" when trying to create a new machine via a backend api request:

export async function createMachine({ fingerprint, platform, licenseKey, userId }) {
  try {
    console.log('Backend createMachine called with:', {
      fingerprint,
      platform,
      licenseKey,
      userId
    })
    const response = await fetch(
      `${env.KEYGEN_BASE_URL}/accounts/${env.KEYGEN_ACCOUNT_ID}/machines`,
      {
        method: 'POST',
        headers: {
          'Content-Type': 'application/vnd.api+json',
          Accept: 'application/vnd.api+json',
          Authorization: `Bearer ${env.KEYGEN_API_PRODUCT_TOKEN}`
        },
        body: JSON.stringify({
          data: {
            type: 'machines',
            attributes: {
              fingerprint: fingerprint,
              platform: platform
            },
            relationships: {
              license: {
                data: {
                  type: 'licenses',
                  id: licenseKey
                }
              },
              owner: {
                data: {
                  type: 'users',
                  id: userId
                }
              }
            }
          }
        })
      }
    )

    const { data, errors } = await response.json()
    if (errors) {
      console.error('Keygen createMachine error:', errors)
      return { success: false, errors, status: response.status }
    }

    console.log('Keygen createMachine success data:', data)
    return { success: true, data, status: response.status }
  } catch (error) {
    console.error('Keygen createMachine request error:', error)
    return { success: false, error: error.message }
  }
}

I'm using the users id to set them as the owner. My backend log confirms its being passed the correct data (they're not the actual values, just representations of them):

Backend createMachine called with: { fingerprint: '12345678-abcdefg', platform: 'Linux', licenseKey: '123456-123456-123456-123456-123456-ab', userId: '12345678-1234-1234-1234-123456789abc' }

[oproso]

UPDATE

I found the issue. I had to pass the license ID, not the key. This was confirmed by the source in the error log.

[ezekg]

Glad you figured it out. You can exchange the license's key for its ID by validating the key before activating, which is best practice anyways to avoid attempting to activate a machine that's already activated, among other things.